Bump secp256k1 from 0.27.0 to 0.31.1

Bumps [secp256k1](https://github.com/rust-bitcoin/rust-secp256k1) from 0.27.0 to 0.31.1.
- [Changelog](https://github.com/rust-bitcoin/rust-secp256k1/blob/master/CHANGELOG.md)
- [Commits](rust-bitcoin/rust-secp256k1@secp256k1-0.27.0...secp256k1-0.31.1)

---
updated-dependencies:
- dependency-name: secp256k1
  dependency-version: 0.31.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -50,7 +50,7 @@ reqwest = { version = "0.11", default-features = false }
 rlp = { version = "0.5", default-features = false }
 rustc-hex = { version = "2", default-features = false }
 scale-info = { version = "2.11.6", default-features = false }
-secp256k1 = { version = "0.27", default-features = false }
+secp256k1 = { version = "0.31", default-features = false }
 serde = { version = "1", default-features = false }
 serde_json = { version = "1", default-features = false }
 sha3 = { version = "0.10", default-features = false }